Onsen by Spring Quality
Find by Water Quality
Onsen water is classified into different types based on its mineral content, each offering unique effects and characteristics. Click on a water quality type to learn more and discover top-ranked hot springs.
10 water qualities, 668 onsens featured
Milky White Water, The Quintessential Onsen
Sulfur Spring
An egg-like aroma — the quintessential hot spring
The Beauty Bath, Silky Smooth Skin
Bicarbonate Spring (Beauty Water)
A smooth, silky soak that leaves skin refreshed
The Warming Bath
Chloride Spring
Salt-rich water that keeps you warm long after bathing
The Wound Bath
Sulfate Spring
Gentle, moisturizing water that soothes skin and old wounds
Nature's Jacuzzi, The Heart Bath
Carbon Dioxide Spring
Tiny bubbles cling to your skin, like a natural jacuzzi
The Women's Bath, Amber Water
Iron Spring
Water that turns reddish-brown in air, rich in iron
The Antiseptic Bath
Acidic Spring
Strongly antiseptic water with a stimulating effect on skin
A Rare Spring Type
Iodine Spring
A rare spring found in only a few places nationwide
The Immunity-Boosting Bath
Radioactive Spring (Radium Spring)
Trace radioactivity for a classic therapeutic soak
The Gentle Bath
Simple Spring
Gentle and mild, safe for children and long soaks